1. What do you think will be the values of y?
Quadratic Graphs
y = x2
Note: - X - = +
So -22 = -2 X -2 = 4
Use it to find the values of x2 x -2 -1 1 2 x2 y 4 1 1 4
What do you think will be the values of y?

2. Quadratic Graphs y = x2 x -2 -1 1 2 x2 4 y1 2 x2 4 y
Now join the points with a smooth curve.
y = x2
We need to plot the values (coordinates) of x and y on the grid to draw the graph.
What happens if y = x2 + 1 or y = x2 – 1.
Let’s Find out.

3. Quadratic Graphs y = x2 y = x2+1 y = x2 - 1
Note: - X - = +
So -22 = -2 X -2 = 4
y = x2
y = x2+1
y = x2 - 1 x -2 -1 1 2 x2 4 y
Remember X2 is the same as before. All we need is to add 1 to x2 to find y. x -2 -1 1 2 x2 4
x2+1 y
Let’s do the same for when y = x2 - 1 x -2 -1 1 2 x2 4
x2-1 3 y
Let’s plot all the three graphs on the grid

4. Quadratic Graphs y = x2 y = x2+1 y=x2-1 x -2 -1 1 2 x2 4 y x -2 -1 1 21 2 x2 4 y
y = x2 +1
y = x2 x -2 -1 1 2 x2 4
x2+1 5 y
y = x2 - 1 x -2 -1 1 2 x2 4
x2-1 3 y
What do you notice curves?
What do you notice about where the
lines cross the y-axis?